Minnich A-1C User manual

A-1C/A-2C Dowel Drill
Operator/Service Manual
Hours of Operation
8:00AM to 4:30PM Mon. – Fri. Eastern Standard Time
277 North Main Street Phone: [phone]
PO Box 367 www.minnich-mfg.com Toll Free: 800.524.1033
Mansfield, OH 44902 e-mail: [email protected] Fax: [phone]
Form: LIT-026 Revised 8/1/2007

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TABLE OF CONTENTS
Section Page #
WARRANTY ------------------------------------------------------------------------------------------------------------ 4
GENERAL SPECIFICATIONS ------------------------------------------------------------------------------------- 5
GENERAL SAFETY RULES---------------------------------------------------------------------------------------- 7
WORK AREA -------------------------------------------------------------------------------------------------- 8
PERSONAL SAFETY---------------------------------------------------------------------------------------- 8
TOOL USE AND CARE ------------------------------------------------------------------------------------- 8
SERVICE-------------------------------------------------------------------------------------------------------- 9
SAFETY DECAL PLACEMENT ----------------------------------------------------------------------------------10
DRILL STEEL AND BITS-------------------------------------------------------------------------------------------14
WARRANTY---------------------------------------------------------------------------------------------------14
GENERAL NOTES ------------------------------------------------------------------------------------------14
DRILL STEEL AND BITS IN STOCK -------------------------------------------------------------------15
USAGE CALCULATION------------------------------------------------------------------------------------16
BIT INSTALLATION AND REMOVAL ------------------------------------------------------------------16
SET-UP PROCEDURE----------------------------------------------------------------------------------------------17
RECOMMENDED LUBRICANTS --------------------------------------------------------------------------------17
OPERATION PROCEDURE ---------------------------------------------------------------------------------------18
MAINTENANCE LUBRICATION CHART----------------------------------------------------------------------19
TROUBLE SHOOTING----------------------------------------------------------------------------------------------20

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TABLE OF CONTENTS CONTINUED
Section Page #
PART BREAKDOWNS
WHEEL ASSEMBLIES A-1C & A-2C------------------------------------------------------------------- 22
BRAKE ASSEMBLY ----------------------------------------------------------------------------------------24
STEERING ASSEMBLY ----------------------------------------------------------------------------------- 26
RAIL ASSEMBLLY A-2C-----------------------------------------------------------------------------------28
RAIL ASSEMBLY A-1C-48--------------------------------------------------------------------------------30
RAIL ASSEMBLY A-1C-36--------------------------------------------------------------------------------32
RAIL ASSEMBLY A-1C-30--------------------------------------------------------------------------------34
RAIL ASSEMBLY A-1C-24--------------------------------------------------------------------------------36
DRILL SUPPORT ASSEMBLY (0A9776-00019) ---------------------------------------------------- 38
CYLINDER END ADJUSTER (0A8353-00000) ------------------------------------------------------ 39
LIFT GROUP A-1C-48--------------------------------------------------------------------------------------40
LIFT GROUP A-1C-36, 30 & 24-------------------------------------------------------------------------- 42
RAIL INSTALLATION A-2C-------------------------------------------------------------------------------44
CASTER ASSEMBLY A-2C-------------------------------------------------------------------------------45
LIFT GROUP A-2C------------------------------------------------------------------------------------------46
AIR SCHEMATIC A-1C ------------------------------------------------------------------------------------48
AIR SCHEMATIC A-2C ------------------------------------------------------------------------------------49
PIPING DIAGRAM A-1C-----------------------------------------------------------------------------------50
PIPING DIAGRAM A-2C-----------------------------------------------------------------------------------52
CONTROL PANEL ASSEMBLY A-1C------------------------------------------------------------------54
CONTROL PANEL ASSEMBLY A-2C------------------------------------------------------------------55
LUBRICATOR INSTALLATION A-1C ------------------------------------------------------------------56
DRILL VALVE (010925-00000) -------------------------------------------------------------------------- 57
VALVES (010935-00000 & 010936-00000)-----------------------------------------------------------58
2-1/2” BORE FEED CYLINDER (011740-XXXXX)--------------------------------------------------59
4” BORE FEED CYLINDER (005664-00000)--------------------------------------------------------- 60
PRESSURE REGULATOR (002880-00000) --------------------------------------------------------- 61
PRESSURE REGULATOR (009626-00010) --------------------------------------------------------- 62
LUBRICATOR (001864-00000) A-1C ------------------------------------------------------------------63
LUBRICATOR (007330-00000) A-2C ------------------------------------------------------------------64
40# ROCK DRILL A-1CL-48 & 36 (012230-00000)-------------------------------------------------66
30# ROCK DRILL A-1CL-30 (A11104-00100)--------------------------------------------------------68
15# ROCK DRILL A-1CL-24 (009052-00000)--------------------------------------------------------70
50# ROCK DRILL A-2C (009350-00000)--------------------------------------------------------------72

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MINNICH MANUFACTURING CO.
WARRANTY AND SERVICE AGREEMENT
Minnich Manufacturing Co. warrants to the original purchaser that, if any part of the product proves defective in material or
workmanship within one year from purchase, and is returned to Minnich Manufacturing Co. within 90 days after the defect
is discovered, Minnich Manufacturing Co. will at its option repair or replace said part. Product shipped to Minnich
Manufacturing Co. freight prepaid will be returned freight prepaid. Product shipped to Minnich Manufacturing Co. freight
collect will be returned freight collect.
LIMITATIONS:
Warranty does not apply to repairs that are required because of normal wear or tear, parts or products that are damaged
as a result of misuse, neglect, accident or fire, or of lightning, flooding or other acts of God, or by improper installation or
maintenance, of which Minnich Manufacturing Co. will be the sole judge. Warranty does not apply to parts or products
that have been modified by an unauthorized party that has in Minnich Manufacturing Co.’s judgment affected their
performance or reliability. Warranty does not apply if the part or product substantially fulfills the performance
specifications.
Minnich Manufacturing Co. shall not in any event be liable for the cost of any special, indirect, or consequential damages
as a result of this product.
SERVICE:
Out of warranty service is available through Minnich Manufacturing Co.

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A-1C
Single Drill, On Slab Unit
Three position drilling with 48” unit: Horizontal, Vertical and 35 degree stitch
Urethane filled tires
3-1 skew drilling standard
Adjustable drill height and depth
Dust collection is available
Specifications shown are standard. Variations to the standard are available.
*Based on 2 piece steel and bits. Whirlybits should be 1” longer for maximum drilling depth.
Model A-1C-48 A-1C-36 A-1C-30 A-1C-24
Drill Steel Shank .875” x 4.25”
(22.2mm x 107.9mm) .875” x 4.25” (22.2mm x 107.9mm) .875” x 3.25” (22.2mm x 82.6mm) .875” x 3.25” (22.2mm x 82.6mm)
Drill Steel Length U.C. 24”(61.0cm) 12”(30.5cm) 12”(30.5cm) 9”(22.9cm)
Drill Bit Diameter .625” – 2.50”
(15.9mm to 63.5mm) .625” – 2.50” (15.9mm to 63.5mm) .625” – 1.625” (15.9mm to 41.3mm) .625” – 1.00” (15.9mm to 25.4mm)
*Maximum Drill Depth 18” (45.7cm) 10” (25.4cm) 10” (25.4cm) 7” (17.8cm)
Drill Distance
From Top of Slab 2.5” – 12.75”
(6.4cm to 32.4cm) 2.5” – 12.75” (6.4cm to 32.4cm) 2.5” – 12.75” (6.4cm to 32.4cm) 2.5” – 12.75” (6.4cm to 32.4cm)
Minimum Cutout Width 48” (121.9cm) 36” (91.4cm) 30” (76.2cm) 24” (61.0cm)
SCFM Required 92.2 (2.61 m3/min) 92.2 (2.61 m3/min) 75 (2.12 m3/min) 36 (1.02 m3/min)
PSIG Required 90 (0.62MPa) 90 (0.62MPa) 90 (0.62MPa) 90 (0.62MPa)
Weight 700lbs. (317.5kg) 665lbs. (301.6kg) 630lbs. (285.8kg) 605lbs. (274.4kg)

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A-2C Multiple Drill,
On Slab Unit with Steering
Three position drilling:
Horizontal, Vertical and 35 degree stitch
Urethane filled tires
Larger oiler for easy maintenance
Adjustable drill height, depth and centers
Dust collection is available
Specifications shown are standard. Variations to the standard are available.
*Based on 2 piece steel and bits. Whirlybits should be 1” longer for maximum drilling depth.
Model A-2C
Drill Steel Shank .875” x 4.25”
(22.2mm x 107.9mm)
Drill Steel Length U.C. 24”(61.0cm)
Drill Bit Diameter .625” – 2.50”
(15.9mm to 63.5mm)
*Maximum Drill Depth 18” (45.7cm)
Drill Distance
From Top of Slab 1.5” – 11.75”
(3.8cm to 29.8cm)
Minimum Cutout Width 48” (121.9cm)
SCFM Required Per Drill 92.2 (2.61 m3/min)
PSIG Required 90 (0.62MPa)
Weight 900lbs. (408.2kg)

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GENERAL SAFETY RULES
This manual contains NOTES, CAUTIONS, and WARNINGS. These MUST be followed to
prevent the possibility of improper use, incorrect servicing, damaging the equipment, or
personal injury. Read and comply with all NOTES, CAUTIONS and WARNINGS included in
these instructions.
NOTE: Notes contain additional information important to the operation of
the equipment.
CAUTION: Cautions provide important information to prevent mistakes
that could result in damage to the equipment.
WARNING: Warnings alert one to practices or conditions that could
lead to personal injury or death!
WARNING
Read and understand all instructions.
Failure to follow all instructions listed below may result in serious injury.
WARNING
DO NOT USE TOOL IF IT IS IN NEED OF SERVICE!
SAVE THESE INSTRUCTIONS

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- WORK AREA –
Keep your work area clean and well lit.
Cluttered and dark areas invite accidents.
Keep bystanders, children, and visitors away while operating a power tool.
Distractions can cause you to lose control.
- PERSONAL SAFETY -
Stay alert, watch what you are doing and use common sense when operating a power tool. DO NOT use tool
while tired or under influence of drugs, alcohol or medication.
A moment of inattention while operating power tools may result in serious personal injury.
Dress properly. DO NOT wear loose clothing, or jewelry. Tie up long hair. Keep your hair, clothing, and gloves
away from moving parts.
Loose clothes, jewelry, or long hair can be caught in moving parts.
Avoid accidental starting. Be sure switch is off before connecting.
Connecting tools that have switches on invites accidents.
DO NOT overreach. Keep proper footing and balance at all times.
Proper footing and balance enables better control of the tool in unexpected situations.
Use safety equipment. Always wear eye and hearing protection.
Dust mask, non-skid safety shoes, hard hat, or hearing protection must be used for appropriate conditions.
Prolonged exposure to loud noise can cause impairment or loss of hearing. Wear suitable hearing protection
device such as earmuffs or earplugs.
Keep a first-aid kit near the drill unit.
Safety depends on you.
- TOOL USE AND CARE -
Only qualified persons should operate the drill unit.
Make sure you operate and service your drill unit correctly.
DO NOT force tool. Use the correct tool for your application.
The correct tool will do the job better and safer at the rate for which it is designed.
DO NOT use tool if switch does not turn it on or off.
Any tool that cannot be controlled with the switch is dangerous and must be repaired.
Disconnect the tool from the power source before making any adjustments, changing accessories, or storing the
tool. Such preventive safety measures reduce the risk of starting the tool accidentally.
Store tools out of the reach of children and other untrained persons.
Tools are dangerous in the hands of untrained users.
Maintain tools with care. Keep tools clean.
Properly maintained tools are less likely to bind and are easier to control.
Check for misalignment or binding of moving parts, breakage of parts, and any other condition that may affect
the tools operation. If damaged, have the tool serviced before using.
Many accidents are caused by poorly maintained tools.
Use only accessories that are recommended by the manufacturer for your model.
Accessories that may be suitable for one tool may become hazardous when used on another tool.

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- SERVICE –
-
DO NOT run the drill unit while you make adjustments and repairs unless the procedure is approved.
Escaping fluid and air under pressure can have sufficient force to penetrate the skin causing serious personal
injury.
If injured by escaping fluid or air, see a doctor at once. Serious infection or reaction can develop if proper medical
treatment is not administered immediately.
Before disconnecting lines, be sure to relieve all pressure. Before applying pressure to the system, be sure all
connections are tight and that lines, popes and hoses are not damaged.
DO NOT use your hand to search for leaks.
Use a piece of cardboard or wood to search for suspected leaks.
Tool service must be performed only by qualified repair personnel.
Service or maintenance performed by unqualified personnel could result in a risk of injury.
When servicing a tool, use only identical replacement parts.
Use of unauthorized parts or failure to follow maintenance instructions may create a risk of injury.

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A-1C Safety Decal Kit Placement (011394-00000)
012287-00006
012287-00008
012287-00001
012287-00003
012287-00007
012287-00012

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012287-00005
012287-00010
012287-00007

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A-2C Safety Decal Kit Placement (011394-00000)
012287-00006
012287-00008
012287-00003
012287-00007
012287-00012

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012287-00005 012287-00010
012287-00007
012287-00008

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Drill Steel and Bits
Warranty Policy
All drill steel and bits sold to customer are intended for use in drilling concrete. It is not
capable of drilling through steel mesh, rebar or dowel bars. Use in these applications
will void all warranties and dramatically shorten bit life. Bit life is also affected by the
sharpness of the bit, type of aggregate and condition of concrete. Minnich
Manufacturing’s drill steel and bit warranty is limited to the warranty provided by the
supplier. All warranty claims must be submitted to Minnich for evaluation and sent to
the supplier for authorization.
General Notes
1. 2” diameter maximum bit for hydraulic drills.
2. 2 1/2” diameter maximum bit for pneumatic drills.
3. 5/8” diameter is the smallest hole diameter.
4. Cutting speed varies from 15 to 30 seconds for a 6” deep hole, depending on bit
diameter and aggregate.
5. On average you can get 180 holes, 9” deep per bit.
6. On average you can get 600 holes, 9” deep per drill steel.
7. Removable bits are carbide and cannot be re-sharpened.
8. Whirly bit steel can be re-sharpened twice.

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Drill Steel & Bits In Stock
1 Piece Steel & Bit (Whirly Bit)
Part Number Hole Diameter Shank Size UC Length
005367-12.00 5/8" (15.9mm) 7/8" x 4 1/4" (22.2mm x 107.9mm) 12" (30.5cm)
005367-24.00 5/8" (15.9mm) 7/8" x 4 1/4" (22.2mm x 107.9mm) 24" (61.0cm)
004209-12.00 3/4" (19.1mm) 7/8" x 4 1/4" (22.2mm x 107.9mm) 12" (30.5cm)
004209-24.00 3/4" (19.1mm) 7/8" x 4 1/4" (22.2mm x 107.9mm) 24" (61.0cm)
004541-12.00 7/8" (22.2mm) 7/8" x 4 1/4" (22.2mm x 107.9mm) 12" (30.5cm)
004541-24.00 7/8" (22.2mm) 7/8" x 4 1/4" (22.2mm x 107.9mm) 24" (61.0cm)
004745-12.00 1" (25.4mm) 7/8" x 4 1/4" (22.2mm x 107.9mm) 12" (30.5cm)
004745-24.00 1" (25.4mm) 7/8" x 4 1/4" (22.2mm x 107.9mm) 24" (61.0cm)
All 4 1/4” shanks can be cut to a 3 1/4” shanks
Tapered Steel
Part Number Shank Size UC Length Notes
003749-12.00 7/8" x 4 1/4" (22.2mm x 107.9mm) 12" (30.5cm)
003749-24.00 7/8" x 4 1/4" (22.2mm x 107.9mm) 24" (61.0cm) For 1” Bits ONLY
003747-1.000
004116-12.00 7/8" x 4 1/4" (22.2mm x 107.9mm) 12" (30.5cm)
004116-24.00 7/8" x 4 1/4" (22.2mm x 107.9mm) 24" (61.0cm) For 1 1/8” & Larger Bits
ONLY
Tapered Bits
Part Number Hole Diameter Shim Part Number Notes
003747-1.000 1" (2.54cm) 003839-00000 Use 003749-12.00 or
003749-24.00 Steel ONLY
003747-1.120 1 1/8" (2.86cm) 003901-00000
003747-1.180 1 3/16” (3.01cm) 003901-00000
003747-1.250 1 1/4” (3.18cm) 003901-00000
003747-1.310 1 5/16” (3.34cm) 003901-00000
003747-1.370 1 3/8” (3.49cm) 003901-00000
003747-1.430 1 7/16” (3.65cm) 003901-00000
003747-1.500 1 1/2” (3.81cm) 003901-00000
003747-1.560 1 9/16” (3.97cm) 003901-00000
003747-1.620 1 5/8” (4.13cm) 003901-00000
003747-1.750 1 3/4” (4.45cm) 003901-00000
003747-1.810 1 13/16” (4.60cm) 003901-00000
003747-1.880 1 7/8” (4.76cm) 003901-00000
003747-2.000 2” (5.08cm) 003901-00000
Use 004116-12.00 or
004116-24.00 Steel ONLY
All 4 1/4” shanks can be cut to a 3 1/4” shanks
“H” Thread Steel
Part Number Shank Size UC Length
005061-24.00 7/8" x 4 1/4" (22.2mm x 107.9mm) 24" (61.0cm)
05061B-24.00 1" x 4 1/4" (25.4mm x 107.9mm) 24" (61.0cm)
“H” Thread Bits
Part Number Hole Diameter Note
005140-1.370 1 3/8” (3.49cm)
005140-1.500 1 1/2” (3.81cm)
005140-1.620 1 5/8” (4.13cm)
005140-1.750 1 3/4” (4.45cm)
005140-1.870 1 7/8” (4.76cm)
005140-2.000 2” (5.08cm)
005140-2.250 2 1/4” (5.72cm)
005140-2.500 2 1/2” (6.35cm) Multiple use bit
All 4 1/4” shanks can be cut to 3 1/4” shanks

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Usage Calculation
The calculations below are nominal and could vary depending on the hardness of the
concrete, aggregates used and the possibility of bits hitting steel reinforcement.
Whirly Bit, Taper Bit and “H” Thread Bit
(B)Bit=180 holes x 9”
B=1620”
Number of bits needed = (number of holes x hole depth)/1620”
Taper Steel and “H” Thread Steel
(S)Steel=600 holes x 9”
S=5400”
Number of steels needed = (number of holes x hole depth)/5400”
Example:
Need 50,000 Holes 12” Deep for the job.
(50,000 x 12)/1620 = 371 Bits
(50,000 x 12)/5400 = 112 Steels
Drill Bit Installation
1. Check to see that the hole through the center of the drill steel is not blocked, if so
remove the object.
2. Clean the tapered end of the drill steel and the inside of the drill bit with a non-
oily cleaner, making sure not to leave any oily residue.
3. Make sure a brass shim is in the drill bit. If not, carefully roll a new one and slide
it into the bit making sure that the ends do not overlap.
4. Put the drill bit on the tapered end of the drill steel and tap it on a firm surface to
seat the bit.
Drill Bit Removal
1. Swing latch so that drill steel can be removed from drill.
2. Pull drill steel out of drill.
3. Using two hammers, place one hammer on bottom side of bit. Using other
hammer, strike the bit on the topside. Rotate drill steel 1/4 turn and strike top of
bit again. Repeat procedure until bit comes off.
CAUTION: Bit may pop off of drill steel with some force.

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A-1C A-2C Set-Up Procedure
1. Lubricator – Make sure that the lubricator is full. See recommended lubricants below.
2. Air Supply – Use a 3/4” hose to supply air to the drill unit.
3. Install the drill steel and bit into the drill.
4. Make sure that the air compressor is on.
5. Position the drill where the first hole is to be drilled and set the brake.
6. Remove the rail locking pin and using the lift valve, lower the rail to the horizontal drilling position.
7. If the rail is not parallel to the surface of the slab, loosen the four bolts in the cylinder end adjuster and turn the
cylinder shaft one way or the other until the rail is parallel with the slab. Re-tighten the four bolts.
8. Make sure the rub strip is against the slab.
9. Using the height adjusting screw, adjust the height to the required distance from the top of the slab to the center of
the hole.
10. Hole Depth – Remove the slider lock pin using the feed lever. Feed the drill bit tight against the slab. Measure from
the end of the drill stop rod to the stop pad and adjust the depth accordingly.
11. Make sure that the regulator is set between 18-22 PSIG.
12. Using the drill control valve, drill the hole until the stop rod is against the stop pad. Measure the actual hole depth
and adjust the stop rod accordingly.
13. You are now ready to start drilling.
Recommended Lubricants
Manufacturer Name Product Name
AGIP RD100
BP HL150
BP HLP150
CASTROL RD OIL 100
ESSO AROX EP-46
MOBIL ALMO 527
SHELL TORCULA OIL 100
TEXACO ROCK DRILL 100

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A-1C A-2C Operation Procedure
1. Lubricator – Make sure that the lubricator is full. See recommended lubricants.
2. Air Supply – Use a 3/4” hose to supply air to the drill unit.
3. Install the drill steel and bit into the drill.
4. Make sure that the air compressor is on.
5. Position the drill where the first hole is to be drilled and set the brake.
6. Remove the rail locking pin.
7. Lower the rail to the horizontal drilling position.
8. Make sure the rub strip is against the slab.
9. Using the feed control valve, feed the bit against the slab.
10. Using the drill control valve, turn the drill on and drill until the stop rod is against the stop pad.
11. Using the drill control valve, turn the drill off and then using the feed control valve, retract the drill from the hole.
NOTE: If the bit will not retract from the hole, feed the drill back into the hole and turn the drill on. With the drill
running use the feed control valve and retract the drill. Immediately shut the drill off one the bit is clear of the hole.
DO NOT HIT THE DRILL SLIDER TO RETRACT THE BIT FROM THE HOLE. THIS WILL DAMAGE THE
SLIDER!
12. Once the hole is drilled, disengage the brake and move the unit to the next hole location, engage the brake, and
then repeat steps 8 – 11.

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TROUBLE SHOOTING AIR DRILL
IF SYMPTOMS OF POOR PERFORMANCE DEVELOP, THE FOLLOWING CHART CAN BE USED AS A GUIDE TO
DETERMINE THE PROBLEM. WHEN DIAGNOSING FAULTS IN OPERATION OF THE AIR DRILL, ALWAYS CHECK
THAT THE COMPRESSOR IS SUPPLYING THE CORRECT SCFM AND AIR PRESSURE AS LISTED IN THE TABLE
PROBLEM CAUSE REMEDY
DRILL NOT GETTING AIR 1. ON MULTI DRILL UNITS, SWITCH AIRLINE WITH
DRILL THAT IS WORKING PROPERLY. IF DRILL
NOW RUNS CHECK THE AIR CONTROL VALVE.
IF THE VALVE WORKS, CHECK THE DRILL.
2. CHECK VALVE ON AIR COMPRESSOR AND
DRILL UNIT TO BE CERTAIN THEY ARE
COMPLETELY OPEN.
3. CHECK COMPRESSOR. IT SHOULD HAVE
100SCFM PER DRILL AND 110PSI AT DRILL
MANIFOLD WHEN DRILLING WITH LARGE
DRILLS.
4. MAKE CERTAIN ALL FITTINGS ARE
CONNECTED PROPERLY AND NOT LEAKING.
COUPLING OR HOSE
OBSTRUCTION
REMOVE OBSTRUCTION.
FAILURE IN THE ELECTRICAL
CIRCUIT
CHECK SWITCHES, CONNECTIONS, COILS, GROUND &
VOLTAGE. IF THE POWER UNIT (BACKHOES, GRADER,
ETC.) IS BEING JUMP STARTED, CHECK THE AMPS &
VOLTAGE BEING SUPPLIED TO COILS FROM THE
BATTERY, IT MAY BE TOO LOW.
FAILURE OF DRILL SOLENOID
VALVE (MULTI DRILL UNITS WITH
REMOTE ELECTRICAL
CONTROLS)
CHECK VALVE - YOU SHOULD BE ABLE TO FEEL THE
SOLENOID MOVE WHEN IT IS ACTUATED. MAKE SURE
YOU HAVE CURRENT TO THE SOLENOID COIL.
REPLACE THE SOLENOID IF THERE IS NO MOVEMENT.
DRILL DOES NOT RUN
MECHANICAL FAILURE OF DRILL DISASSEMBLE THE DRILL & INSPECT IT FOR
DAMAGED PARTS.